Blue Storm Karma Dragon, Maelstrom "Яeverse"

:At the end of the battle that your rear-guard attacked, if that attack did not hit, [lock one of your rear-guards], and this unit gets +10000 until end of turn. If you have a card with "Maelstrom" in its card name in your soul, choose one of your opponent's rear-guards, and retire it. :When this unit attacks, if it is the fourth battle of that turn or more, 1, and this unit gets +1/drive +1 until end of turn. At the end of that battle, if that attack did not hit, for each of your locked cards, your opponent chooses a card from their hand or rear-guards, and puts it into their drop.